U.S. patent application number 11/745792 was filed with the patent office on 2007-11-08 for multi-seamed warming devices with adhesive and methods of warming.
Invention is credited to Burl Jackson Bandy, Uma Ramachandran, Daniel H. Yim.
Application Number | 20070256677 11/745792 |
Document ID | / |
Family ID | 39790319 |
Filed Date | 2007-11-08 |
United States Patent
Application |
20070256677 |
Kind Code |
A1 |
Yim; Daniel H. ; et
al. |
November 8, 2007 |
MULTI-SEAMED WARMING DEVICES WITH ADHESIVE AND METHODS OF
WARMING
Abstract
Self-contained disposable single-use heat-generating apparatuses
and methods for providing heat are disclosed that have adhesive
formed on at least a portion thereof. One exemplary apparatus
includes a heat-generating pack having a first bag layer defined by
a first surface area bonded to a second bag layer defined by a
second surface area and creating multiple pouches therebetween. A
heat-generating agent is disposed within the pouches and adapted to
consume air at a predetermined consumption rate in an exothermic
reaction. At least a portion of one of the first surface area and
the second surface area comprises an air permeable surface area
having a predetermined airflow rate such that the heat-generating
agent remains substantially evenly distributed within the
pouches.
Inventors: |
Yim; Daniel H.; (Rocky Face,
GA) ; Bandy; Burl Jackson; (Dalton, GA) ;
Ramachandran; Uma; (Dalton, GA) |
Correspondence
Address: |
THOMAS, KAYDEN, HORSTEMEYER & RISLEY, LLP
100 GALLERIA PARKWAY, NW
STE 1750
ATLANTA
GA
30339-5948
US
|
Family ID: |
39790319 |
Appl. No.: |
11/745792 |
Filed: |
May 8, 2007 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
11099807 |
Apr 6, 2005 |
|
|
|
11745792 |
May 8, 2007 |
|
|
|
10405668 |
Apr 1, 2003 |
6886553 |
|
|
11099807 |
Apr 6, 2005 |
|
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Current U.S.
Class: |
126/263.02 |
Current CPC
Class: |
A61F 7/03 20130101; A61F
7/034 20130101; A61F 2007/0001 20130101; A61F 2007/0226 20130101;
A61F 2007/023 20130101 |
Class at
Publication: |
126/263.02 |
International
Class: |
A61F 7/00 20060101
A61F007/00 |
Claims
1. A self-contained, disposable, single-use heat-generating
apparatus, comprising: a heat-generating pack comprising: a first
bag layer having a first surface area; a second bag layer having a
second surface area, said second bag layer being fixed to said
first bag layer, such that said first bag layer and said second bag
layer define a plurality of pouches therebetween; a heat-generating
agent disposed in the pouches, said heat-generating agent arranged
and configured to consume air at a predetermined air consumption
rate in an exothermic reaction; at least one of said first surface
area and said second surface area comprising an air permeable
surface area having a predetermined airflow rate at which air is
introduced to said heat-generating agent, said predetermined
airflow rate being arranged and configured to be less than said
predetermined air consumption rate, whereby a differential pressure
is created between the first surface area and the second surface
area, wherein said heat-generating agent remains substantially
evenly distributed within said pouch; and wherein at least one of
said first surface area and said second surface area comprises an
adhesive disposed only on a portion of a perimeter of an outside
surface of the surface area.
2. The apparatus of claim 1, wherein said first bag layer is
defined by a set of dimensions substantially corresponding to a set
of dimensions defining said second bag layer.
3. The apparatus of claim 1, wherein at least one of said first bag
layer and said second bag layer comprises a microporous
material.
4. The apparatus of claim 3, wherein said microporous material
comprises a fabric having a plurality of fibers forming an
inter-locking web, wherein at least a portion of said plurality of
fibers are bonded to each other.
5. The apparatus of claim 1, wherein at least one of said first
surface area and said second surface area comprises a low
coefficient of friction.
6. The apparatus of claim 1, further comprising: a protective
package for receiving said heat-generating pack, said protective
package being air impermeable and retarding said exothermic
reaction.
7. The apparatus of claim 6, wherein said protective package is
hermetically sealed with said heat-generating pack disposed
therein.
8. The apparatus of claim 1, wherein the pouches are formed from
seams in the heat-generating pack.
9. The apparatus of claim 8, wherein the seams in the
heat-generating pack have adhesive disposed thereon.
10. The apparatus of claim 1, wherein the adhesive on the perimeter
of the air impermeable surface area extends all the way to all
edges of the air impermeable surface area.
11. The apparatus of claim 1, wherein the heat-generating agent
disposed in each of the pouches is free flowing prior to its
consumption of air.
12. The apparatus of claim 1, wherein the plurality of
heat-generating pouches comprise a substantially constant
thickness, whereby a substantially even heat profile is emitted
across the surface area of the first bag layer and the second bag
layer.
13. The apparatus of claim 1, wherein the pouches are formed from
pockets in the heat-generating pack.
14. The apparatus of claim 1, wherein the adhesive has a releasable
liner disposed thereon.
15. The apparatus of claim 1, further comprising a scented
composition disposed in the pouches.
16. A self-contained, disposable, single-use heat-generating
apparatus, comprising: a heat-generating pack comprising: a first
bag layer having a first surface area; a second bag layer having a
second surface area, said second bag layer being fixed to said
first bag layer, such that said first bag layer and said second bag
layer define a plurality of pouches therebetween; a heat-generating
agent disposed in the pouches, said heat-generating agent arranged
and configured to consume air at a predetermined air consumption
rate in an exothermic reaction; at least one of said first surface
area and said second surface area comprises an air permeable
surface area having a predetermined airflow rate at which air is
introduced to said heat-generating agent, said predetermined
airflow rate being arranged and configured to be less than said
predetermined air consumption rate such that said heat-generating
agent remains substantially evenly distributed within said pouch;
and wherein at least one of said first surface area and said second
surface area comprises an adhesive disposed on substantially all of
a perimeter of an outside surface of the surface area.
17. The apparatus of claim 1, wherein the adhesive is disposed on
the entire perimeter of the outside surface of the surface
area.
18. A method for providing therapeutic heat, comprising the steps
of: containing a heat-generating composition in a plurality of
pouches in a self-contained heat-generating pack, the composition
having a predetermined air consumption rate; introducing air to
said heat-generating composition at a predetermined airflow rate
arranged and configured to be less than said air consumption rate
such that the heat-generating composition remains substantially
evenly distributed within the heat-generating pack; and providing
adhesive on only a perimeter portion of one outside surface of the
heat-generating pack.
19. The method of claim 18, further comprising the step of removing
said self-contained heat-generating pack from an air impermeable
protective package and removing a releasable liner from the
adhesive.
20. The method of claim 18, further comprising forming the pouches
in the heat-generating pack by forming seams in the heat-generating
pack, wherein the adhesive is disposed on the seams of the
heat-generating pack.
21. The method of claim 18, further comprising forming the pouches
in the heat-generating pack by forming seams in the heat-generating
pack, wherein the seams are formed by at least one of the following
methods: melting, bonding, and sewing together two layers of
material of the heat-generating pack.
22. The method of claim 18, further comprising applying the
adhesive portion of the heat-generating pack to a user's skin.
23. The method of claim 18, wherein the heat-generating pack is
used for therapeutic purposes and the heat generated from the pack
has a therapeutic temperature range.
Description
CLAIM OF PRIORITY/RELATED APPLICATION(S)
[0001] The present application is a continuation-in-part of, and
claims priority to, co-pending U.S. patent application Ser. No.
11/099,807, filed Apr. 6, 2005, and entitled, "Multi-Seamed
Self-Contained Personal Warming Apparatus and Method of Warming,"
which is a continuation-in-part of U.S. patent application Ser. No.
10/405,668, filed Apr. 1, 2003, and entitled, "Self-Contained
Personal Warming Apparatus and Method of Warming," now U.S. Pat.
No. 6,886,553, the disclosures of both of which are hereby
incorporated by reference herein in their entirety.
[0002] The present application is related to U.S. patent
application Ser. Nos. ______, both filed on even date herewith
(Attorney Docket Nos. 010887-1070 and 010887-1080), the disclosures
of both of which are incorporated herein by reference in their
entirety.
TECHNICAL FIELD
[0003] The present disclosure is generally related to warming
devices and, more particularly, is related to a self-contained
personal warming apparatus and method of warming.
BACKGROUND
[0004] Heat-generating pouches of various configurations and shapes
are designed and used for various purposes, such as hand warming,
feet warming, and the like, by placing the heat-generating pouch in
a glove, mitten, shoe, etc. Heat-generating pouches typically
include a heat-generating compound disposed between at least two
layers of material, such as fabric, or the like, assembled to form
a pouch. The heat-generating compound emits heat during an
exothermic chemical reaction resulting from exposure of the
compound to air. Known heat-generating compounds typically include
a loose granular substance that is freely movable within the pouch.
With a freely movable compound, when the pouch is placed flat, or
horizontally, the compound is somewhat evenly distributed
throughout the pouch. However, when the pouch is placed vertically,
moved around, or jostled, the compound is drawn by gravity, shifts,
and settles toward one end of the pouch. This shifting and settling
of the compound is sometimes referred to as a "tea-bag" effect. The
tea-bag effect results in an uneven temperature profile along the
surface area of the pouch and produces an uncomfortable feeling for
a user of the pouch. An uneven temperature profile can result in
some areas not receiving heat, as desired, or an over concentration
of heat in other areas.
[0005] The problem of the compound tending to shift and settle
within the pouch has been addressed by other configurations of
heat-generating pouches. In one embodiment, the heat-generating
compound is contained within pucks or pellets that are disposed
between at least two layers of material. The pucks or pellets
comprise a heat-generating compound capable of reacting with air in
an exothermic reaction. The compound is compressed into
concentrated, substantially rigid, pellets. In this configuration,
however, the heat emission is concentrated at the pucks, resulting
in an uneven heat distribution across the surface area of the
pouch. Furthermore, because the pucks are rigid, the pucks do not
conform to various contours of the human body against which the
heat-generating pouch may be placed.
[0006] The undesirable effect of a shifting compound has also been
addressed by introducing air to the heat-generating compound
through only one of the two layers of material forming the pouch,
while the other of the two layers of material comprises a
self-adhesive. However, these adhesive pouches cannot be easily
inserted into pockets formed in socks, gloves, mittens, specially
designed belts, or the like for use. Indeed, such adhesive pouches
are typically fixed to an interior surface of a user's clothing. In
this configuration of use, the pouch moves away from the user's
skin as the clothing moves away from the user's skin. Furthermore,
fixing the pouch to a user's clothing typically results in minimal
or no pressure being applied to the pouch as the pouch is applied
to the user's skin, thereby rendering the pouch less effective.
[0007] Prevailing medical knowledge is that in order to be
considered therapeutic (e.g., for relief of muscle, joint, and/or
menstrual cramp pain), a personal warming device emits heat to warm
skin to a temperature range of about 39-45.degree. C. Adhesive that
has been applied to cover all or substantially all of a layer of
material forming the personal warming device that is applied to a
user's skin results in constant, uninterrupted contact of the
device with the skin. At the very least it can discomfort a user,
and can even exceed the therapeutic temperature range and cause
burns. Adhesive that only intermittently covers the surface area of
the side of the warming device applied to a user's skin, however,
can result in the edges of the warming device being lifted and the
warming device inadvertently removed or peeled off the user's skin,
such as when clothing engages an edge of the device and wedges
under it. Adhesive applied only in tabs at each end of an elongated
personal warming device (e.g., as in a back compress) can still
result in the warming device from pulling away from a user's skin
upon movement by the user.
[0008] Thus, a heretofore unaddressed need exists in the industry
to address the aforementioned deficiencies and inadequacies.
SUMMARY
[0009] One embodiment of the present disclosure provides a
self-contained disposable single-use heat-generating apparatus and
methods of providing therapeutic heat. Briefly described, in
architecture, one embodiment of the apparatus can be implemented as
follows. A self-contained disposable single-use heat-generating
apparatus includes a heat-generating pack having a first bag layer
bonded to a second bag layer creating a plurality of pouches
therebetween. A heat-generating agent is disposed in the pouch. At
least a portion of one of the first bag layer and the second bag
layer has an air permeable surface area with a predetermined
airflow rate, and the other of said first surface area and said
second surface area comprises an air impermeable surface area with
an adhesive disposed on at least a portion of a perimeter of an
outside surface of the air impermeable surface area. The airflow
rate through the air permeable surface area is predetermined such
that the heat-generating agent remains substantially evenly
distributed within the pouches.
[0010] Other embodiments of the present disclosure can also be
viewed as a method for providing therapeutic heat, including
forming and/or using the heat-generating apparatus. In this regard,
one embodiment of such a method, among others, can be broadly
summarized by the following steps: containing a heat-generating
composition in a plurality of pouches in a self-contained
heat-generating pack and introducing air to the heat-generating
composition such that the heat-generating composition remains
substantially evenly distributed within the heat-generating pack
and providing adhesive on only a portion of one outside surface of
the heat-generating pack.
[0011] Other systems, methods, features, and advantages of the
present disclosure will be or become apparent to one with skill in
the art upon examination of the following drawings and detailed
description. It is intended that all such additional systems,
methods, features, and advantages be included within this
description, be within the scope of the present disclosure, and be
protected by the accompanying claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Many aspects of the disclosure can be better understood with
reference to the following drawings. The components in the drawings
are not necessarily to scale, emphasis instead being placed upon
clearly illustrating the principles of the present disclosure.
Moreover, in the drawings, like reference numerals designate
corresponding parts throughout the several views.
[0013] FIG. 1 is a cutaway perspective view of an embodiment of the
disclosed self-contained personal warming apparatus.
[0014] FIG. 1A is a perspective view of an embodiment of a
self-contained personal warming apparatus illustrated in FIG.
1.
[0015] FIG. 2 is a plan view of an embodiment of a bag layer of the
apparatus illustrated in FIG. 1.
[0016] FIG. 3 is a plan view of an embodiment of a bag layer of the
apparatus illustrated in FIG. 1.
[0017] FIG. 4 is a plan view of an embodiment of a bag layer of the
apparatus illustrated in FIG. 1.
[0018] FIG. 5 is a plan view of an embodiment of the disclosed
self-contained personal warming apparatus.
[0019] FIG. 6 is a plan view of an embodiment of the disclosed
self-contained personal warming apparatus.
[0020] FIG. 7 is a plan view of an embodiment of the disclosed
self-contained personal warming apparatus.
DETAILED DESCRIPTION
[0021] It is desirable to place adhesive on at least a portion of a
heat-generating apparatus in order to adhere the apparatus to a
user's skin or clothing. In order to prevent burns to a user's skin
from a therapeutic heat-generating apparatus, adhesive is
preferable only applied to discrete portions of the apparatus, and
not to the entire surface touching a user's skin. In particular,
adhesive disposed only on at least a portion of the perimeter
secures the apparatus to a user's skin and/or clothing.
[0022] FIG. 1 illustrates one preferred embodiment of a disclosed
self-contained disposable single-use heat-generating apparatus 10.
A heat-generating pack 11 comprises a first bag layer 12, a second
bag layer 14 and a heat-generating agent 16 disposed therebetween.
The first bag layer 12 is defined by a first set of dimensions and
has a first surface area. The second bag layer 14 is defined by a
second set of dimensions and has a second surface area. It should
be noted that although the dimensions of the first bag layer 12 and
the second bag layer 14 are illustrated as being substantially
rectangular in shape, the dimensions can form any suitable shape.
The first surface area can substantially correspond to the second
surface area.
[0023] The first bag layer 12 and the second bag layer 14 are
aligned, one on top of the other, and are fixed together by at
least one seam 18. The seam 18 can either extend around the
perimeter of the heat-generating pack 11 where the first bag layer
12 and second bag layer 14 meet, or run along one or a plurality of
edges thereof. As illustrated in FIG. 1, the seam 18 runs along two
opposing edges. The seam 18 is created in any suitable manner, for
example by melting, bonding, or sewing.
[0024] At least one enclosed space, or pouch 20, is created between
the first bag layer 12 and the second bag layer 14. Although only
one enclosed space 20 is shown in FIG. 1, as discussed later,
multiple pouches 20 can be formed in the heat-generating pack 11.
At least a portion of one of the first surface area and/or the
second surface area is/are preferably air permeable as discussed in
greater detail below. The first bag layer 12 and the second bag
layer 14 preferably comprise a flexible fabric, material, or the
like.
[0025] A heat-generating agent 16 is disposed within the pouch 20
and contained therein. The heat-generating agent 16 comprises a
main ingredient of iron powder and incorporates therein water, a
water retaining material (e.g., charcoal, vermiculite, or the
like), an oxidation promoter, such as activated carbon, and salt.
More particularly, and as an example, the agent 16 may comprise
approximately 35-50% by weight of iron powder, 25-45% by weight of
water, approximately 10-14% by weight of water retaining agent, and
approximately 4.5-6% by weight of salt. Upon exposure to air,
oxidation of the iron begins in an exothermic reaction. The heat
generated by the exothermic reaction of the agent 16 passes through
the first bag layer 12 and the second bag layer 14 and radiates
from the apparatus 10. It is preferable that the heat radiating
from the apparatus 10 warms skin to a temperature range from about
39-45.degree. C. in order to provide a level of heat suitable for
therapeutic heating.
[0026] During the exothermic reaction, the heat-generating agent 16
consumes air at a predetermined air consumption rate. Controlling
the rate of introduction of air to the heat-generating agent 16
affects both the temperature radiated from the pack 11, as well as
the shifting of the agent 16 within the pouch 20. Generally, the
more air introduced to the heat-generating agent 16, the hotter the
pack 11 will become. Also, where the heat-generating agent 16
consumes air faster than air is introduced to thereto, a vacuum
will be created.
[0027] More specifically, and with reference to FIG. 1A, an
embodiment of the self-contained disposable single-use
heat-generating apparatus 10a is illustrated. In this embodiment,
the heat-generating pack 11 is disposed inside a protective package
22. The protective package 22 can be hermetically sealed with the
heat-generating pack 11 inside such that no air or minimal air is
introduced to the heat-generating pack 11. In this embodiment, the
protective package 22 effectively eliminates the introduction of
air to the agent 16 thereby substantially preventing the
heat-generating exothermic reaction. The heat-generating pack 11 is
disposed within the protective package 22 preferably at, or closely
after, the time of manufacture, and the heat-generating apparatus
10 can be marketed, sold, and stored in this configuration.
[0028] Referring next to FIGS. 2-4, various embodiments of bag
layers 13, 15 and 17 are illustrated. The bag layers 13, 15 and 17
can comprise the first bag layer 12, the second bag layer 14 or any
suitable combination thereof in order to form a heat-generating
pack 11. For example, a heat-generating pack 11 can comprise a
first bag layer 12 arranged in the configuration of bag layer 13
(FIG. 2) and a second bag layer 14 arranged in the configuration of
bag layer 17 (FIG. 4).
[0029] Selection of the configuration of first bag layer 12 and
second bag layer 14 is driven by a desired airflow rate for
introduction of air to the heat-generating agent 16. An air
consumption rate of the heat-generating agent 16 being at least
slightly greater than an airflow introduction rate to the agent 16
generates at least a slight vacuum inside the pouch 20. The vacuum
created inside the pouch 20 reduces shifting and settling of the
heat-generating agent 16, or "tea-bagging," within the pouch 20.
Thus, the heat-generating agent 16 can remain in place in the pouch
20 through the use of differential pressure.
[0030] The substantially stationary disposition of the
heat-generating agent 16 inside the pouch 20 results in a
heat-generating pack 11 that maintains a substantially constant
thickness. A substantially even heat profile is emitted across the
surface area of the first bag layer 12 and the second bag layer 14.
The airflow rate through the combined first surface area and second
surface area of the first bag layer 12 and second bag layer 14
preferably is less than the predetermined air consumption rate of
the heat-generating agent 16 during exothermic reaction. For
example, a heat-generating pack 11 having porosity allowing an
airflow rate of 20,000 sec./100 cc of air preferably contains a
heat-generating agent 16 having an air consumption rate greater
than 20,000 sec./100 cc of air during the exothermic reaction.
[0031] Referring more specifically to FIG. 2, one embodiment of the
bag layer 13 configuration comprises an air permeable surface area
24. The air permeable surface area 24 preferably comprises a
microporous fabric. A preferred microporous fabric can comprise a
nonwoven fabric formed from individual fibers that are pressed
together forming an interlocking web of fibers. The fibers can be
fixed to each other either mechanically (for example, by tangling
the fibers together) or chemically (for example, by gluing,
bonding, or melting the fibers together). The disclosed
heat-generating pack 11 can comprise a microporous fabric known to
one having ordinary skill in the art.
[0032] FIG. 3 illustrates another embodiment of a bag layer 15
configuration having a portion of the surface area thereof
comprising an air permeable surface area 24 and a portion of the
surface area comprising an air impermeable surface area 26. In one
embodiment, all surface areas of the bag layer 15 can be of a
material of low permeability, so long as differential pressure is
created between surface areas 24, 26.
[0033] The air permeable surface area 24 preferably comprises a
microporous fabric. A preferred microporous fabric for this
configuration can comprise a nonwoven fabric formed from individual
fibers that are pressed together forming an interlocking web of
fibers. The fibers can be fixed to each other either mechanically
(for example, by tangling the fibers together) or chemically (for
example, by gluing, bonding, or melting the fibers together). This
configuration can comprise a microporous fabric known to one having
ordinary skill in the art. The air impermeable surface area 26 of
the bag layer 15 can include polyethylene, polypropylene, or any
suitable material. In one embodiment, the air impermeable surface
area 26 exhibits a low coefficient of friction, such as to allow
the heat-generating pack 11 to easily slide into a pocket (not
shown) formed in a glove, sock, belt for holding heat-generating
packs in position, or the like. The preferred combination of air
permeable surface area 24 and air impermeable surface area 26 of
the bag layer 15 of FIG. 3 is determined by the desired air flow
introduction rate to the heat-generating agent 16 inside a pouch 20
that this bag layer 15 configuration can be used to form. In other
embodiments, the air impermeable surface area 26 does not have a
low coefficient of friction, while in other embodiments, the air
permeable surface area 24 has a low coefficient of friction.
[0034] FIG. 4 illustrates another embodiment of a bag layer 17
configuration. The bag layer 17 comprises an air impermeable
surface area 26, such as polyethylene, or any suitable material. In
one embodiment, the air impermeable surface area 26 exhibits a low
coefficient of friction, such as to allow the heat-generating pack
11 to easily slide into a pocket (not shown) formed in a glove,
sock, belt for holding heat-generating packs in position, or the
like. In other embodiments, the air impermeable surface area 26
does not have a low coefficient of friction.
[0035] An adhesive can be applied to a portion of the air
impermeable surface area 26 of the bag. In one embodiment, the
adhesive is applied at least to the perimeter 50 of the impermeable
surface area. In one embodiment, the adhesive is applied only to
the perimeter 50 of the impermeable surface area. The adhesive is
not applied to the entire impermeable surface area 26 for a
personal warming device used for therapeutic purposes (e.g., where
the user's skin is warmed to about 39-45.degree. C.). In one
embodiment the adhesive is a composition suitable for attaching the
heat-generating pack 11 to a user's skin. Adhesives that are
suitable for the disclosed heat-generating packs 11 include
synthetic elastomers suitable for attachment of the heat-generating
pack 11 to a user's skin and then removal after use. An example of
a suitable adhesive includes a double-coated adhesive tape. The
double-coated tape can include two (2) sides coated with same on
different adhesives. The adhesive on the side of the tape facing
the pack 11 can be, for example, a synthetic latex adhesive. The
adhesive on the side of the tape facing a user's skin can be a
medical-grade and/or hypoallergenic tape, such as, but not limited
to, an acrylate-based adhesive. An exemplary double-coated adhesive
tape is commercially available from 3M Inc. of St. Paul, Minn.,
USA. Adhesives that are suitable for the heat-generating pack 11
also include those disclosed in U.S. Pat. No. 6,177,482 to Cinelli
et al., incorporated herein by reference in its entirety.
[0036] The adhesive can be applied to the heat generating pack by,
for example, spraying, deposition by a drop-on-demand device (e.g.,
an ink-jet device), painting, rolling, taping, etc. In one
embodiment of the heat-generating pack 11, the adhesive has applied
thereto a releasable liner for protection of the adhesive prior to
application of the heat-generating pack to a user's skin.
[0037] Applying the above disclosed bag layer configurations 13,
15, and 17, heat-generating packs 11 of various configurations can
be formed. One configuration of a heat-generating pack 11 comprises
a first bag layer 12 comprising the bag layer 13 configuration
having an air permeable surface area 24 (illustrated in FIG. 2) and
a second bag layer 14 comprising the bag layer 17 configuration
having an air impermeable surface area 26 (illustrated in FIG. 4).
In this configuration, the rate at which air is introduced to the
heat-generating agent 16 is controlled by allowing a pre-determined
flow rate through the first bag layer 12 and allowing substantially
no air flow through the second bag layer 14.
[0038] Another configuration of a heat-generating pack 11 comprises
a first bag layer 12 having an air permeable surface area 24
(illustrated in FIG. 2) and a second bag layer 14 also having an
air permeable surface area 24 (illustrated in FIG. 2). In this
configuration, the rate at which air is introduced to the
heat-generating agent 16 is controlled by allowing a pre-determined
flow rate through both the first bag layer 12 and the second bag
layer 14.
[0039] An embodiment of the disclosed heat-generating pack 11 can
also comprise a first bag layer 12 comprising the bag layer 13
having an air permeable surface area 24 (illustrated in FIG. 2) and
a second bag layer 14 comprising the bag layer 15 having a portion
of the surface area being an air permeable surface area 24 and a
portion of the surface area being an air impermeable surface area
26 (illustrated in FIG. 3). In this configuration, the rate at
which air is introduced to the heat-generating agent 16 is
controlled by the total air permeable surface area 24 of the first
bag layer 12 and the second bag layer 14 combined. It is preferable
that the airflow rate through the total air permeable surface area
24 of the first bag layer 12 and the second bag layer 14 combined
is less than the air consumption rate of the heat-generating agent
16 during exothermic reaction.
[0040] An embodiment of the disclosed heat-generating pack 11 can
also comprise a first bag layer 12 comprising the bag layer 17
having an air impermeable surface area 26 (illustrated in FIG. 4)
and a second bag layer 14 comprising the bag layer 15 having a
portion of the surface area being an air permeable surface area 24
and a portion of the surface area being an air impermeable surface
area 26 (illustrated in FIG. 3). In this configuration the rate at
which air is introduced to the heat-generating agent 16 is
controlled by the total air permeable surface area 24 of the second
bag layer 14. It is preferable that the airflow rate through the
total air permeable surface area 24 of the second bag layer 14
combined is less than the air consumption rate of the
heat-generating agent 16 during exothermic reaction.
[0041] It should be noted that the above described heat-generating
packs 11 are mere examples and that any configuration combining air
permeable surface area 24 with the air impermeable surface area 26
is contemplated by the present disclosure.
[0042] In one method of use of an embodiment of the disclosed
self-contained disposable single-use heat-generating apparatus 10,
a heat-generating pack 11 is disposed in a protective package 22 to
eliminate, or at least minimize, introduction of air to the
heat-generating agent 16 disposed inside the pack 11. The
heat-generating pack 11 is removed from the protective package 22.
Air is introduced to a heat-generating agent 16 disposed within a
pouch 20 of the heat-generating pack 11. The pouch 20 is formed by
a first bag layer 12 and a second bag layer 14 being peripherally
bonded to each other. The heat-generating agent 16 consumes air in
a heat-generating exothermic reaction, thereby emitting heat from
the heat-generating pack 11. At least one of the first bag layer 12
and the second bag layer 14, or a combination thereof, allow air to
be introduced to the heat-generating agent 16. The introduction of
air is preferably at a flow rate less than the air consumption rate
of the heat-generating agent 16 during the exothermic reaction. The
heat-generating pack 11 can be positioned, as desired.
[0043] In one method of use, the heat-generating pack 11 can be
inserted into a pocket, for example a pocket disposed in a belt for
heat application near a user's skin on their back, stomach, or any
desired location. The heat-generating pack 11 can also be inserted
into a pocket formed in a sock or glove for a user to warm toes and
fingers, respectively.
[0044] The exothermic reaction of the heat-generating agent 16 when
introduced to air produces a therapeutic heat emission. Upon the
conclusion of the exothermic reaction and the cooling down of the
heat-generating pack 11, the heat-generating pack 11 can be removed
from the position at which it was placed for use and disposed.
[0045] As noted above and demonstrated in FIG. 5, multiple pouches
20 can be formed in the heat-generating pack 11. In one exemplary
configuration, the first bag layer 12 and the second bag layer 14
are fixed together or joined at multiple seams, such as a first
seam 18 and a second seam 19 shown in FIG. 5. In one such
embodiment, the first seam 18 and a second seam 19 compartmentalize
the heat-generating pack 11 into separate heat-generating pouches
20. In the embodiment depicted, the first seam 18 extends around
the perimeter of the heat-generating pack 11. The second seam 19
extends between two separate pouches 20. In one embodiment, the
seam 18, extending around the perimeter of the pack 11, has
adhesive disposed thereon. In one embodiment, the adhesive extends
all the way to the edge of the pack 11. In one embodiment, both the
first seam 18 and the second seam 19 have adhesive disposed
thereon, extending around the perimeter of the pack and through a
middle portion thereof.
[0046] The first seam 18 and the second seam 19 can be formed in
the same or a different manner. For example, one seam 18 can be
formed first, followed by the formation of the second seam 19.
Alternatively, both the first seam 18 and the second seam 19 can be
created by, for example, melting both seams at the same time. Even
though one particular configuration has been shown in FIG. 5 for
the first seam 18 and the second seam 19, one can envision other
embodiments of a multi-seamed pack 11, for example in a criss-cross
shape (as illustrated in FIG. 6), or multiple vertical and/or
horizontal seams.
[0047] Alternatively, multiple pouches 20 can be formed from the
first bag layer 12 and the second bag layer 14 as shown in FIG. 7.
The pouches 20 can be smaller in size and can be formed more as
pockets in the heat-generating pack 11. In this manner, areas 30
are formed in the pack 11 whereby the first bag layer 12 and the
second bag layer 14 are touching in some manner to prevent shifting
of the heat-generating agent from one pouch 20 to another. In one
embodiment, the areas 30 extending between the pouches 20 have
adhesive applied thereto. In one embodiment, the areas 30 have
adhesive applied thereon only around the perimeter, and extending
all the way to the edge of the heat-generating pack 11. The pouches
20 illustrated in FIG. 7 can be formed by discrete seams around
each pouch, or by generally melting or bonding the first bag layer
12 to the second bag layer 14 to bonded areas 30.
[0048] In one embodiment, the areas 30 are larger than necessary
for simply sealing the pouches 20. In one embodiment, the adhesive
is not disposed over any portion of the pouches 20 containing the
heat-generating agent.
[0049] In one embodiment of the disclosed heat-generating apparatus
10, the pouches 20 can include one or more scented compositions. As
the heat-generating agent 16 emits heat, the scented substances in
the pouches 20 will emit a stronger fragrance with the heat. The
scent can be, for example, but not limited to one or more of the
following: fruits, flowers, spices, or combinations thereof.
[0050] It should be emphasized that the above-described embodiments
of the present disclosure are merely possible examples of
implementations, and are merely set forth for a clear understanding
of the principles herein. Many variations and modifications may be
made to the above-described embodiment(s) without departing
substantially from the spirit and principles of the disclosure. All
such modifications and variations are intended to be included
herein within the scope of this disclosure and protected by the
following claims.
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